Go library for more reliable interactions with sysfs drivers. The sysfs library
assumes that your interactions with a sysfs driver are simple all-or-nothing
reading or writing data to files under /sys/class/.... To make the
interactions simpler and easier to test, write your classes to receive and use a
sysfs.DeviceFile interface rather than directly writing to the device files.
Testing and running on systems without the sysfs drivers can use the
DeviceFile implementations in sysfs/sysfstest to simulate the behavior
of a device, allow the app to be used on systems without the correct
drivers, and generate reliable input for testing.
When used in production builds, the standard HardwareFile implementation
can be proxied with other support classes in sysfs that will log
sysfs interactions, gather statistics, etc.